chr12-56343438-C-T

Position:

• chr12-56343438-C-T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 3P and 4B. PM2 PP2 BP4_Strong

The NM_005419.4(STAT2):​c.2507G>A​(p.Arg836His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,658 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R836C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000068 (0 hom.)
• Consequence: STAT2 NM_005419.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.17

Genes affected

STAT2 (HGNC:11363): (signal transducer and activator of transcription 2) The protein encoded by this gene is a member of the STAT protein family. In response to cytokines and growth factors, STAT family members are phosphorylated by the receptor associated kinases, and then form homo- or heterodimers that translocate to the cell nucleus where they act as transcription activators. In response to interferon (IFN), this protein forms a complex with STAT1 and IFN regulatory factor family protein p48 (ISGF3G), in which this protein acts as a transactivator, but lacks the ability to bind DNA directly. The protein mediates innate antiviral activity. Mutations in this gene result in Immunodeficiency 44. [provided by RefSeq, Aug 2020]

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), STAT2. . Gene score misZ 2.5952 (greater than the threshold 3.09). Trascript score misZ 3.6431 (greater than threshold 3.09). GenCC has associacion of gene with primary immunodeficiency with post-measles-mumps-rubella vaccine viral infection, pseudo-TORCH syndrome 3.
• BP4: Computational evidence support a benign effect (MetaRNN=0.04257959).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
STAT2	NM_005419.4	c.2507G>A	p.Arg836His	missense_variant	24/24	ENST00000314128.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
STAT2	ENST00000314128.9	c.2507G>A	p.Arg836His	missense_variant	24/24	1	NM_005419.4	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000684 AC: 10 AN: 1461658 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 727142

Gnomad4 AFR exome AF: 0.0000597

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000719

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000113

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary immunodeficiency with post-measles-mumps-rubella vaccine viral infection Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 15, 2018

This sequence change replaces arginine with histidine at codon 836 of the STAT2 protein (p.Arg836His). The arginine residue is weakly conserved and there is a small physicochemical difference between arginine and histidine. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the ExAC database. This variant has not been reported in the literature in individuals with STAT2-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The histidine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.059
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.71
CADD	Benign	7.5
DANN	Benign	0.79
DEOGEN2	Benign	0.046	T;.
Eigen	Benign	-1.6
Eigen_PC	Benign	-1.6
FATHMM_MKL	Benign	0.0087	N
LIST_S2	Benign	0.70	T;T
M_CAP	Benign	0.0047	T
MetaRNN	Benign	0.043	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-1.4	N;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.17	T
PROVEAN	Benign	-0.19	N;N
REVEL	Benign	0.010
Sift	Benign	0.27	T;T
Sift4G	Benign	0.63	T;T
Polyphen		0.0010	B;.
Vest4		0.039
MutPred		0.34		Loss of phosphorylation at S838 (P = 0.0731);.;
MVP		0.19
MPC		0.50
ClinPred		0.020	T
GERP RS		-3.9
Varity_R		0.015
gMVP		0.11

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs759254318; hg19: chr12-56737222;